TVNZ has set up a hotline for any urgent queries: "If you have made it through to the next round, we will contact you. This could be after the 18th of June so please don't panic if you don't hear from us on Monday."
Celebrity agent Andy Haden said he understood the judges were to have been announced last month. Rachel Hunter is still a favourite to be named, alongside an overseas judge and a music industry figure.
A TVNZ spokeswoman said judges would be announced shortly. "We are unable to comment on the judging line-up for the show until all contracts have been signed."